the taliban commander by way of background banned the vaccinations. says at least ten health care workers have been killed since december. pakistan, one of just three countries where polio remains a threat. >>> and kazakhstan, talks are under way about iran's nuclear program. there are representative there's from iran, germany, and the five permanent members of the united nations security council. the u.s., france, britain, russia, china. since last round of talks last june, iran's uranium enrichment program has expanded violating u.n. resolutions. >> iran's claiming its program is for civilian use only, energy and such things but western leaders fear iran is building a nuclear bomb. >>> canada, a group of scientists is now calling for food to be dna tested to make sure these things, products, are what they say they really are. >> now paula newton will report test willing keep horse meat from ending up in beef products and other types of food fraud. >> reporter: with all of the new food scares i bet you're wondering if there's any way to know for sure